What Is The Difference Between Sand Cast vs. Centrifugal Cast Bronze Bearings?

Sand casting and centrifugal casting are two distinct methods for producing metal parts, each with its own characteristics and applications. Sand casting is suitable for various shapes and sizes, making it ideal for creating intricate parts in various shapes. It is also known for its fast turnaround times and can be used for both small and large production runs. On the other hand, centrifugal casting is typically reserved for symmetrical parts, such as tubes, and is limited in its ability to produce special shapes and certain lengths. It is often used to create cylindrical parts and can be employed with a wide range of alloys, including aluminum, copper, bronze, and stainless steel. The centrifugal force generated during the process pushes the metal against the mold’s walls, creating a hollow part. Additionally, centrifugal casting is known for producing high-quality metal parts with a consistent and uniform wall thickness, making it suitable for various applications. Both methods have their strengths based on the types of parts they are most suitable for, and the choice between the two depends on the specific requirements of the project.

The Difference Between Sand Cast And Centrifugal Cast Bushes

Understanding Sand Casting

What is sand casting?

Sand casting is a traditional method for producing bronze bearings. It involves creating a mold from a mixture of sand and a binding agent.

Process of sand casting

  • Creating the mold: A pattern of the desired part is made and then pressed into a mixture of sand and binder.
  • Pouring molten metal: Once the mold is ready, molten bronze is poured into the cavity.
  • Cooling and solidification: The bronze cools and solidifies within the mold.
  • Removal and finishing: After cooling, the casting is removed from the mold and finished to achieve the desired dimensions and surface quality.

Advantages and disadvantages

  • Advantages:
    • Low tooling costs
    • Suitable for complex shapes
    • Can produce large components
  • Disadvantages:
    • Limited dimensional accuracy
    • Rough surface finish
    • Porosity issues

Insights into Centrifugal Cast Bushes

What is centrifugal casting?

Centrifugal casting is a method that utilizes centrifugal force to distribute molten metal into a mold cavity.

Process of centrifugal casting

  • Spinning the mold: The mold is rotated at high speeds around its axis.
  • Pouring molten metal: Molten bronze is poured into the spinning mold.
  • Centrifugal force distribution: The centrifugal force pushes the molten metal towards the mold walls, resulting in uniform material distribution.
  • Cooling and solidification: As the mold continues to spin, the bronze cools and solidifies.
  • Removal and finishing: Once solidified, the casting is removed from the mold and finished as required.

Advantages and disadvantages

  • Advantages:
    • Excellent material density and uniformity
    • Superior surface finish
    • Reduced porosity
  • Disadvantages:
    • Higher tooling costs
    • Limited to cylindrical shapes
    • Smaller size range

Key Differences Between Sand Cast and Centrifugal Cast Bronze Bearings

Material distribution

In sand casting, material distribution may not be uniform due to the manual pouring process, resulting in inconsistencies. Conversely, centrifugal casting ensures excellent material density and uniformity due to the centrifugal force.

Surface finish

Sand cast bronze bearings typically have a rough surface finish, requiring additional machining or finishing processes. Centrifugal casting offers a superior surface finish without the need for extensive post-processing.

Size limitations

Sand casting can accommodate larger and more complex shapes, making it suitable for a broader range of sizes. On the other hand, centrifugal casting is limited to cylindrical shapes and smaller components.


Sand casting generally has lower tooling costs and is more cost-effective for large volume production runs. Centrifugal casting involves higher tooling costs but offers better quality and consistency, making it economical for specialized applications.

Applications and Industries

Bronze bearings produced through sand casting are commonly used in heavy machinery, automotive applications, and industrial equipment where cost-effectiveness is crucial. Centrifugal cast bronze bearings find applications in high-performance machinery, aerospace, and marine industries where superior quality and reliability are paramount.